Below are some famous trek in maharashtra - Mumbai.
1. Kalsubai ....maharshtra highest peak
2. sadhan valley....samrad village approx 50km fr kasara station in bhandardara region
3. Lonavala Rajmachi...2 hrs. from lonavala station by private vehicle above all are 2 days 2 nights trek max. 3 day activity like trekking ,staying in tent, exploring jungle etc...